Scottish King Duncan, with the aid of loyal Macbeth and Banquo, defeats the rebel army. Macbeth is rewarded with the title Thane of Cawdor. The three witches greet Macbeth with that title and prophesy he will be king and that Banquo will be the father of kings. Macbeth starts to plot to murder Duncan.
Royal Shakespeare with Ian McKellen version is at https://www.youtube.com/watch?v=IgEshHhnLqU . There is also the Orson Welles version on Youtube, but I can't really recommend that.
